Product Selection Guide · 02 of 04
Natural vs. Synthetic — Is It Really That Simple?
The "natural" label on supplements is one of the most misleading in the industry. It has no regulated definition in most jurisdictions — and for many nutrients, the synthetic form is either equivalent or superior in bioavailability.
What "natural" actually means (and doesn't)
In the US, the FDA has not formally defined "natural" for dietary supplements. In the EU, the term is similarly unregulated for supplements. A manufacturer can call a product "natural" based on loosely defined criteria with no independent verification.
Full article in development — covering the regulatory landscape, marketing vs. reality, and a nutrient-by-nutrient breakdown of where source matters.
Where source actually matters
| Nutrient | Natural form | Synthetic form | Evidence says |
|---|---|---|---|
| Vitamin E | d-alpha-tocopherol | dl-alpha-tocopherol | Natural form is approximately 2x more bioavailable |
| Folate (B9) | Food folate (5-MTHF) | Folic acid | 5-MTHF is the active form and preferred for those with MTHFR variants |
| Vitamin K2 | MK-7 (from natto) | MK-4 (synthetic) | MK-7 has longer half-life; source matters less than form type |
| Vitamin C | Whole food sources | Ascorbic acid | Bioavailability is essentially equivalent at standard doses |
| Beta-Carotene | Mixed carotenoids | Isolated synthetic | Mixed forms may be safer; isolated high-dose synthetic associated with lung cancer risk in smokers |